Friday, June 18

Science

Oceans without oxygen
Science

Oceans without oxygen

Oceans without oxygenWith no dissolved oxygen to sustain animals or plants, ocean anoxic zones are areas where only microbes suited to the environment can live. "You don't get big fish," said UC Santa Barbara biogeochemist Morgan Raven. "You don't even get charismatic zooplankton." But although anoxic oceans may seem alien to organisms like ourselves that breathe oxygen, they're full of life, she said. These strange ecosystems are expanding, thanks to climate change -- a development that is of concern for fisheries and anyone who relies on oxygen-rich oceans. But what piques Raven's interest is the changing chemistry of the oceans -- the Earth's largest carbon sink -- and how it could move carbon from the atmosphere to long-term reservoirs like rocks. "What happens to our carbon cycle as w...
Electrostatic Induction
Science

Electrostatic Induction

Electrostatic Induction 072 - Electrostatic Induction In this video Paul Andersen explains how the charge distribution can be affected my electric forces produced by a charged object. In an insulator charges are fixed but in conductors the charges can move. Induction occurs when the charges in an object influence charges in another object. An electroscope can be used to observe induction and conduction. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/translations/ Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: Denholm, Tim. English: Image of a Piece of Pure Gold Leaf T...
COVID-19 virus enters the brain, research strongly suggests
Science

COVID-19 virus enters the brain, research strongly suggests

COVID-19 virus enters the brain, research strongly suggestsMore and more evidence is coming out that people with COVID-19 are suffering from cognitive effects, such as brain fog and fatigue. And researchers are discovering why. The SARS-CoV-2 virus, like many viruses before it, is bad news for the brain. In a study published Dec.16 in Nature Neuroscience, researchers found that the spike protein, often depicted as the red arms of the virus, can cross the blood-brain barrier in mice. This strongly suggests that SARS-CoV-2, the cause of COVID-19, can enter the brain. The spike protein, often called the S1 protein, dictates which cells the virus can enter. Usually, the virus does the same thing as its binding protein, said lead author William A. Banks, a professor of medicine at the Universit...
How climate change is disrupting ecosystems
Science

How climate change is disrupting ecosystems

How climate change is disrupting ecosystemsThe world is getting warmer and warmer -- and many organisms native to lower latitudes or elevations are moving higher. However, novel organisms moving into a new habitat could disturb the ecological balance which has been established over a long period. Plants and herbivores are characterised by long-term co-evolution, shaping both their geographic distribution and the characteristics that they display in their occupied sites. At higher elevations, this is seen in insect herbivores being generally less abundant and plants in turn being less well defended against herbivores, as a result of lower energy and shorter growing seasons. In contrast, low-elevation plant species defend themselves against more abundant and diverse herbivores, whether by me...